Harold c



(No Model.)

H. O. SHUBERT. ELECTRIC ARC LAMP.

No, 439,904. Patented Nov. 4, 1890.

' UNITED STATES PATENT OFFICE.

HAROLD C. SHUBERT, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE \VESTERN ELECTRIC COMPANY, OF SAME PLACE.

ELECTRIC-ARC LAM P.

SPECIFICATION forming part of Letters Patent No. 439,904, dated November 4, 1890.

Application filed August 30, 1890. Serial No. 363,584. (No model.)

To all whom it may concern.-

Be it known that I, HAROLD C. SHUBERT, a citizen of the United States, residing in Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Electric Arc Lamps, of which the following is a specification.

My invention relates to electric-arc lamps; and it has for its object to produce such a lamp which shall be simple and cheap in construction and in which the electric arc shall be maintained by means of a positive feed automatically controlled by the current pass ing through and feeding the lamp, and at the same time the objectionable blinking and jumping of the arc shall be prevented.

To these ends my invention consists in an are-lamp provided with the appliances and constructed and operated substantially as hereinafter more particularly set forth.

Referring to the accompanying drawings, forming part of this specification, Figure l is aside view of so much of a lamp as is necessary to illustrate my invent-ion. Fig. 2 is a detail showing the feeding device. Fig. 3 is an automatic arrangement of circuits, and Fig. 4 is a detail showing a modification of the feeding device.

The operative parts of the lamp are mounted in a frame Q, which is suitably connected to the frame-work of the lamp, but preferably insulated therefrom in the usual way, and inside of this frame Q, is a smaller frame I, and passing through both the outer and inner frame is the upper-carbon holder or rod A, having the extended head a at one end and carrying the carbon at its other end inthe usual manner. This carbonholder passes through openings in the outer frame, which serve as guides for the holder, and also through Openings in the inner frame, and thus the holder acts to some extent as a guide for said frame, one or more pins X being also fixed to the outer frame and sliding in perforations in the inner frame to insure its proper movement.

Mounted in the outer frame and secured thereto is the main or series magnet J, having an armature I, arranged above its core, which armature is supported in the arms or levers N, which pass on either side of the inner frame P and carbon-holder and are pivoted to the inner frame at Z. These levers are fulcrumed on rod Y, adjustably secured to the frame Q by means of thumlmscrew O, and above the armature I is secured one portion of a dashpot or retarding device H.

Mounted in the movable frame is the shuntmagnet or solenoid K, the core D thereof being connected to the two levers C C, which are pivoted to the inner frame at the point 0 and which support at their outer ends the other member of the dash-pot or retarding device H. Connected to the levers C, as at the point I, is a spring L, the other end of which is secured to the inner frame, as by the projection m, and is provided with an adjusting-nut M, whereby the tension of the spring may be regulated.

In order to insure the passage of the current through the carbon-holder without resistance, as well as to form a mechanical resistance to the holder, I provide a springplate F, which is attached to the inner frame, as at the point G, and an adj Listing-screw U regulates the pressure of the spring against the carbon holder. The main current is conducted from the magnet .I by an insulated conductor \V, connected to the inner frame, as at the point V.

Pivoted between the levers C is a feed-dog B, the lower edge of which is in the form of a knife-edge, either straight or, as shown in the drawings, semicircular, so as to surround and en gage with more or less of the carbon-holder A. The upper end of this dog, as shown in Fig. l, is connected by a spring E to an upward-extending projection on the levers, and this spring tends to maintain the dog normally in contact with the carbon-rod. In Fig. at I have shown a similar construction, except that the dog is connected by a spring E to the inner frame I, the function and operation of the parts being practically the same in both instances. Projecting from the dog B is a trip-arm 13, which under certain conditions hereinafter explained comes in contact with a stop consisting of a set-screw e, that passes through a lug q, projecting from the frame Q, and thereby trips the dog, moving it out of contact with the carbon-rod and permitting said rod to fall by gravity.

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Connected to the outer frame but insulated therefrom is a cut-out consisting, essentially, of a core-piece R, surrounded by a coil and supporting a contact piece T, insulated therefrom and having pivoted to one end of the core-piece a lever or armature S, which normally remains out of contact with the insulated block '1, but which, on being brought into contact therewith, completes the circuit and cuts out the lamp. The ends of the levers O are arranged directly under this lever S, and are provided with an extension or knob O',which under certain conditions hereinafter described comes in contact with the lever S and closes the cut-out circuit, which being once closed the current flowing through the coils thereof will energize sufficiently to maintain contact between the insulated block T and the lever S until the lamp is properly adjusted for operation.

The proportions of the parts as thus constructed may vary; but I preferably so arrange them that the portion of the dash-pot connected to the levers O, aided by the tension of the spring L, will overbalance the weight of the core D and dog B, and will normally cause the dog to slide upward over the carbon-holder. The Weight of the lower portion of the dash-pot and the armature I is preferably less than the weight of the inner frame and its appurtenances, so that when no current is flowing through the lamp the inner frame will be in its lowermost position, resting upon the inner portion of the outer frame.

From this constructionthe operation of the lamp will be apparent. When the current is turned on, the magnet J becomes energized, the carbons being in contact, as is usual, and attracts its armature I. This operates to raise the inner frame P, and the upper-carbon holder, being held or clamped between the spring F and the dog B, is lifted with the frame, establishing the arc. VVheu, however, the resistance of the arc becomes excessive, more current flows through the shunt-magnet K and the core thereof is drawn inward, causing the dog to move downward and its sharp edge engaging the carbon-holder forces it downward positively to feed the upper carbon the required distance to reduce the resistance in the are. As this is accomplished the excess of current in the shunt decreases and the spring L operates to retard the core D and the dog B slides upward over the carhon-holder, as it has not in this condition sufficient bite or friction on the holder to overcome its gravity and the friction of the spring F on the opposite side. It will thus be seen that by properly adjusting the parts a positive feed of the upper carbon is attained, and it is only necessary that comparatively slight variations in the resistance of the arc shall occur to cause the feed to operate, and thereby the objectionable jumping and blinking of the arc is avoided. When the carbon-carrier is fed its full length, or when the head a thereof comes in contact with the outer frame and the resistance of the arc unduly increases, the magnet K is energized; but as the carboncarrier cannot be forced downward to feed the upper carbon on an increase of the current in the shunt-circuit the core will be sufiiciently attracted to cause the dog to slide over the carbon-holder without moving it, and this will proceed beyond the usual movement, so that the toe-piece C of the leversO will come in contact with the armature or lever S-and close the cut-out, when of course, the circuit through the operating-magnets of the lamp being broken, the armature I will then be released and the weight of the inner frame will cause it to assume its normal position inside of the outer frame.

' There are two conditions under which the dog B is tripped so as to release the carbonholder. One of these is the movement of the dog itself beyond its usual limit. In its usual movement it may fail to advance the upper carbon far enough to reduce the excessive resistance of the are, either because the carbon is consumed and the holder has reached the limit of its downward movement, or else because a piece of the carbon has been broken ofi. In either case when the dog has continued downward beyond the limit of its usual movement its trip-arm B will come in contact with the stop 6 and the dog will be moved out of contact with the holder. This takes place before the core 1) has been drawn down far enough to cut out the lamp, so that if the failure of the dog to advance the carbon far enough to overcome the excessive resistance of the arc is due to the fact that a portion of the carbon has been broken off the instant'the dog is tripped the carbon will fall by gravity and reduce the arc to normal before the lamp is cut out. If, however, the failure is due to the fact that the carbon is consumed andthe holder has reached the limit of its downward movement, then after the dog is tripped the downward movement of the core D will continue until the toe O raises the armature S and cuts out the lamp. The other condition under which the dog B is tripped is the absence of a current through the main magnet J. Whatever may be the condition of the carbons, if the current through the main magnet is stopped the inner frame P will fall to its normal position, as already described, and in doing so the trip-arm B Will come in contact with the stop 6 and trip the. dog, leaving the holder free to fall by gravity. The parts are so proportioned that whenever the lamp is out of action the feeddog will be out of engagement with the carhon-holder.

While I have thus specifically described the embodiment of my invention shown in the accompanying drawings, it will be evident totthose skilled in the art that the details of construction and arrangement maybe varied without departing from the essential features thereof, and I do not therefore limit myself t0 the precise construction and arrangement shown.

What I claim is- 1. In an electric-arc lamp, the combination, with the carbon-holder, of a spring bearing upon one side thereof and a pivoted feed-dog upon the other side thereof, the said dog having a knife edge whereby the holder is positively fed, substantially as described.

2. In an electric-arc lamp, the combination, with the carbon-holder, of an adjustable spring bearing upon one side thereof and a pivoted feed-dog having a curved knife engaging a portion of the opposite side thereof, substantially as described.

3. In an electric-arc lamp, the combination, with the outer frame and the inner movable frame, of a carbon-holder passing through both frames, a lever connected to the inner frame carrying the positive feeding-dog, and a shunt-magnet also connected to the inner frame for operating the feeding-dog, substantially as described.

4. In an electric-arc lamp, the combination of the outer frame, the inner movable frame, the carbon-carrier passing through both frames, a lever connected to the inner frame, carrying a positive feedingdog, a shunt electro-magnet connected to the inner frame for operating the dog, and a spring also connected to the inner frame and to the lever, substantially as described.

5. In an electric-arc lamp, the combination, with the inner frame and carbon-carrier passing through the same, of a lever pivoted to the frame, a dog pivoted to the levers, a spring for pressing the dog against the carbon carrier, a shunt-magnet for operating the lever in one direction, and a spring connected to the frame for operating the lever in the other direction, substantially as described.

6. In an electric-arc lamp, the combination, with the frame, of the carbon-carrier passing through the same, a spring connected to the frame, bearing against the carbon-carrier on one side, a lever connected to the frame and carrying a dog bearing against the carboncarrier on the other side, a shunt-magnet for operating the lever in one direction, and the spring for operating the lever in the other direction, substantially as described.

7. Inan electric-arc lamp, the combination, with the outer frame, a main electro-magnet connected therewith, an armature-lever for said outer frame, provided with one member, of a retarding device, an inner movable frame connected to said armature-lever, a shuntmagnet carried by the inner frame, and alever connected to the inner frame carrying a dog engaging the carbon-carrier and having the other member of the retarding device secured thereto, substantially as described.

8. In an electric-arc lamp, the combination, with the outer frame carrying the main electro-magnet and the cut-out, of the inner frame carrying the shunt electro-magnet, a carbonholder passing through both frames and provided with a head, and a lever connected to the inner frame carrying a positive feeding-dog operated by the shunt-magnet for operating the cut-out, substantially as described.

9. In an electric-arc lamp, the combination, with the outer frame carrying the main electro-magnet, of an inner frame carrying the shunt electro-magnet, an armature for the main magnet controlling the inner frame to establish the arc, and a positive feeding device mounted on the inner frame controlled by the shunt-magnet to maintain the arc, substantially as set forth.

10. In an electric-arc lamp, the combination, with the carbon-holder, a frame, and an electro-magnet, of a lever pivoted to the frame and operated by said electro-m agnet, a spring actuated dog pivoted to said lever, engaging carbon-holder and having a trip-arm, and a stop adapted to engage said trip-arm, substantially as described.

11. In an electric-arc lamp, the combination, with the carbon-holder and two relativelymovable frames, of afeed-dog carried by one of said frames and normally engaging said holder, a stop carried by the other frame and adapted to trip said dog, and an electro-magnet adapted to move one of said frames rela tively to the other, substantially as described.

12. In an electric-arc lamp, the combination, with the carbon-holder, of the relatively-movable frames P and Q, the feed-dog carried by frame P and normally engaging said holder, the trip-arm B, projecting from said dog, the shunt-magnet K, also carried by frame P and adapted to operate the feed-dog, the stop fixed to frame Q in the path of the trip-arm B, and the main magnet J, also carried by frame Q and adapted to move frame P, substantially as described.

HAROLD C. SHUBERT.

Witnesses:

L. M. HOPKINS, L. K. CURLETT.

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